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. 1978 Apr;49(4):503.
doi: 10.1063/1.1135449.

High-flux beam source of fast neutral helium

D W Fahey  1 , L D Schearer, W F Parks
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High-flux beam source of fast neutral helium

D W Fahey et al. Rev Sci Instrum. 1978 Apr.

Abstract

A high-flux beam source of fast neutral helium has been constructed by extending the designs of previous authors. The source is a dc or pulsed electric discharge in an expanding gas nozzle. The beam produced has a flux on the order of 10(15) atoms/s sr and a mean velocity on the order of 10(7) cm/s. The composition of the beam has been determined by the use of particle detectors and by the observation of the excitation of certain target gases. An upper bound of 3.7 x 10(-5) has been estimated for the He(2(3)S(1))/He((1)S(0))beam density ratio and a value of 0.2 found for the He(+)/He(1(1)S(0)) beam density ratio.

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